PSYC 2410 Study Guide - Midterm Guide: Fenfluramine, Dyslexia, Rodent
14 Jun 2016
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Nonpolar fatty acid tails form a hydrophobic region between the hydrophilic heads. At body temperature, the interior of the bilayer is fluid (aqueous intracellular space) Located on extracellular or intracellular side of transmembrane proteins. Typically enzymes (facilitate chemical reactions & helps attachment) Lipids of the membrane form a barrier to hydrophilic molecules (soluble) Diffusion- movement of substance along a concentration gradient (high to low) lipid- soluble molecules (eg. Electrostatic pressure- charged particle ion (+ or -) Only specific ions allowed through certain ion channels. Open/closed- differential membrane permeability regulated by different mechanisms (chemical, mechanical, electrical) Membrane potential difference in electrical charge between the inside and outside of a cell. Neuronal resting potential is -70 millivolts (inside is more negative than outside) Na+ and cl- more concentrated outside the cell. K+ and protein ions- more concentrated inside the cell. Diffusion na+ is driven inside, k+ is driven outside. Electrostatic pressure k+ is kept inside, na+ is also kept inside.
